SpringBoot Admin - Kubernetes - server to override client URL
After research, there are properties exposed from SpringBoot Admin to achieve this:
spring.boot.admin.client.instance.health-url=https://my-override-kubernetes.com/healthspring.boot.admin.client.instance.management-url=https://my-override-kubernetes.com.com/healthspring.boot.admin.client.instance.service-url=https://my-override-kubernetes.com.com/health